The race to reveal antimatter’s secrets

Gibney, Elizabeth

doi:10.1038/548020a

Cited by 3 publications

(1 citation statement)

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“…The production of stable antihydrogen atoms relies on the slowing down of antiprotonsp with initial energies of the order of MeVs or keVs to thermal energies [1]. The first step for achieving this is to use thin degrader foils to reduce the kinetic energy to the order of a few keV [2,3].…”

Section: Introductionmentioning

confidence: 99%

Nuclear stopping power of antiprotons

et al. 2017

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The slowing down of energetic ions in materials is determined by the nuclear and electronic stopping powers. Both of these have been studied extensively for ordinary-matter ions. For antiprotons, however, there are numerous studies of the electronic stopping power, but none of the nuclear stopping power. Here, we use quantum-chemical methods to calculate interparticle potentials between antiprotons and different atoms, and derive from these the nuclear stopping power of antiprotons in solids. The results show that the antiproton nuclear stopping powers are much stronger than those of protons, and can also be stronger than the electronic stopping power at the lowest energies. The interparticle potentials are also implemented in a molecular dynamics ion range calculation code, which allows us to simulate antiproton transmission through degrader foil materials. Foil transmission simulations carried out at experimentally relevant conditions show that the choice of antiproton-atom interaction model has a large effect on the predicted yield of antiprotons slowed down to low (a few keV) energies.

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Section: Introductionmentioning

confidence: 99%